US2633502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical communication switchboard
Assignee: AT&T Inc
•
Filing: 1949-04-26
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Granted: 1953-03-31
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Expires: 1969-04-26
Abstract
No abstract record available.
Inventors
- 👤 Warren W Carpenter
- 👤 Paul B Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:08
CPC Classifications
H; H01; H01H; H01H63/00; H01H63/36; H01H63/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |